ACTA HORTICULTURAE SINICA ›› 2016, Vol. 43 ›› Issue (5): 885-896.doi: 10.16420/j.issn.0513-353x.2015-0970

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Effects of Grafting on the Fast Chlorophyll Fluorescence Induction Dynamics of Pepper Seedlings Under Temperature Stress

LIU Qian-qian1,2,MA Shou-bin1,FENG Xi-huan1,SUN Yan3,YI Yan-jun4,and LIU Wei-xin1,2,*   

  1. (1College of Horticulture,Qingdao Agricultural University,Qingdao,Shandong 266109,China;2Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticultural Plants,Qingdao,Shandong 266109,China;3Qingdao Nanbei Seed Company,Qingdao,Shandong 266109,China;4College of Life Science,Qingdao Agricultural University,Qingdao,Shandong 266109,China)
  • Online:2016-05-25 Published:2016-05-25


Effects of grafting on the pepper fast chlorophyll fluorescence induction kinetics were studied under high temperature(45 ± 1)℃ and low temperature(4 ± 1)℃ stress in this study. The grafted pepper‘P205or‘Yelimu’was used as a rootstock,and the self-rooted pepper‘Sandaojin’was used as a scion. Results showed that the fast chlorophyll fluorescence induction curve(OJIP)of self-rooted seedlings had significant changes with a decrease in JI and P points after heat and chilling stress. JIP-test revealed a significant K phase. Under heat treatmentthe ΔK values of self-rooted and grafted seedlings were more than twice higher than those under the chilling stressindicating that the photosynthetic apparatus of pepper leaves were more susceptible to heat injury. Under heat and chilling stressthe self-rooted seedlings had the greater decrease than those of the grafted seedlings in maximum photochemical efficiencyFv/Fmand performance indexPIabs. The PIabs was more sensitive to heat and chilling stress than Fv/Fm. For all the tested materialsthe phenomenological energy fluxes per excited cross sectionABS/CSm?TRo/CSm and ETo/CSmand the density of RCsRC/CSmwere decreasedwhile the relative variable fluorescence at J-stepVJ),the dissipated energy flux per CSDIo/CSm),the quantum yield for energy dissipationΨDoand the total performance indexPItotalwere increased. All fluorescence parameters of self-rooted seedlings had significant difference compared to the control group. RootstockP205andYelimuwere adaptable for heat and chilling treatmentrespectively. The PItotal of grafted and self-rooted pepper increased sharply after high or low temperature stressfollowed with a complete recovery at 25 after 4 hsuggesting that the photosynthetic apparatus of photosystemⅠ(PSⅠ)was less damaged than PS during the temperature stresses.

Key words: pepper, grafted, JIP-test, chlorophyll fluorescence kinetics, temperature stress

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